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APPARATUS FOR HEATING BAKING GOMPARTMENTS OR 0001mm VESSBLS, &c.

No. 443,516. Patented Dec. 30, 1890.

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D. GROVE. APPARATUS FOR HEATING BAKING GOMPARTMENTS OR COOKING VESSELS,650. No. 443,516. Patented Dec. 30, 1890.

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No. 443,516.- Patented De0.30,1890.

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UNITED STATES PATENT Denice.

DAVID GROVE, OF BERLIN, GERMANY.

APPARATUS FOR HEATING BAKING-COMPARTMENTS OR COOKING-VESSELS, do.

SPECIFICATION forming part of Letters Patent No. 443,516, dated December30, 1890.

Application filed January 15, 1889. Serial No. 296,423. (No model.)Patented in England January 19, 1884,11'0. 1,780, and

June 3,1886, No. 7,454-

To all whom it may concern:

Be it known that I, DAVID GROVE, of No. 24: Friedrich Strasse, in thecity of Berlin, in the Empire of Germany, have invented acertain new anduseful Apparatus for Heating l-Eaking-Compartments or Cooking-Vessels bya Continuous Current of Heated Air, (patented in Great Britain January19, 1884:, No. 1,780, and June 3, 1886, No. 7,454,) of which I declarethe following to be a specification.

My invention relates to an improved apparatus for heatingbaking-compartments or cooking-vessels by a continuous current of heatedair, the baking or cooking operation being elfected by means ofsuperheated air supplied by an air-heating chamber in such manner thatthe heated air is caused to circulate around the baking or cookingcompartments or vessels, communicate its warmth to the same, and descendto the air-heating chamber surrounding the calorifier or heater, whereit is again heated and recircnlates around the aforementioned baking orcooking compartments or vessels. In this mannera perfectly equableheating of the entire baking or cookresented the application of myinvention for baking and cooking purposes.

Figure 1 is a vertical crosssection; Fig. 2, a vertical longitudinalsection; Fig.3, a horizontal section on the line A B C D in Fig. 1. Fig.4 is a vertical section on the lineU V W X in Fig. 6 of a modified formof baking-oven. Fig. 5 is a vertical longitudinal section with thecombustion-chamber broken away and indicated only by dotted lines. Fig.6 is a horizontal section on the line G H J K in Fig. 4. Fig. 7 is avertical section on the line Q R S T in Fig. 9. Fig. 8 is a verticallongitudinal section with the combustion-chamber removed and indicatedonly by dotted lines. Fig. 9 is a horizontal section on the line M N O Pin Fig. 7. Fig. 10 is a vertical section of another modification of myinvention applied to a cooking apparatus. Fig. 11 isa verticallongitudinal section, and Fig. 12 a horizontal section on the line 1 2 34 in Fig. 10.

C6 is the baking-compartment or cookingvessel, beneath which theair-heating chamber Z) is arranged, the air in which is heated by asuitable furnace with grate hand heater or combustion-chamber c. Theproducts of combustion pass through the said comb ustionchamber orheater 0 into the chimney. The hot air in the heating-chamber b ascendsthrough the opening 0 beneath the baking or cooking compartment orvessel to and is distributed in the ascending canals e, which run aroundthe baking-compartment.

When the hot air has communicated its heat to the baking-compartment, itpasses through the opening 10 into the descending canals or channels f,Figs. 1, 2, and 3, de scends in the same into the air-heating chamherI), where it is again heated, and is caused to circulate asaforedescribed.

The Walls of the baking-compartments are clad with a non-conductingmaterial 01, which is thickest at those parts where the heated air hasthe highest temperature and gradually decreasing from this point, Figs.1, 4:, and 7.

The canals f, in which the cooled air descends, are protected againstthe heat radiating from the combustion-chamber c by a layer of isolatingmaterial 9, so that the contrary currents of air and eddies areprevented.

In the modification, Figs. 4, 5, and 6, the heated air flows through thelateral openings at into the ascending canals or channels 6 and throughthe opening it into the, descending canals f, surrounding thebaking-compartment a. After having communicated its heat to thebaking-compartment the cooled air descends through the openings 19 inthe top of the air-heating chamber Z) into the canals f, and from thenceinto the air-heating chamber b, where the same becomes again heated andcirculates as aforedescribed. The lower surface of thebaking-compartment is heated, as aforementioned, by the heated air fromthe air-heating chamber 1), ascending through the opening 0, which,after communicating its heat to the bottom of the baking-compare ment(1, descends again into the chamber Z) through the canalf. The walls ofthe balcing-com jiartment are, as aforedescribed, clad withnon-conducting material, the thickness of which varies according to thetemperature 01: the air.

The canals e and flor the ascending heated and descending cooled air arerepresented side by side along the walls of the bakingcompartment, Figs.7, S, and 9; but the aircirculation remains as above described,theheatcdair ascending through the opening 0 and the canals 0, passes at1.: and p into the canals f and f, and descends in the same into theair-heating chamber (1.

I llZLYO represented only one bakingeompartrnent in the accompanyingdrawings; but it will be evident that more than one suchbaking-compartment can be employed and that the same can be placed sideby side or above each other.

Figs. 10, ll, and 12 represent my invention applied to cookingvessels.The hot air from the air-heating chamber 1) ascends through the slots 0in the top of the horizontal wall which divides the air-heatingchamber 1) from the chamber 0, in which the cooking-vessels aresuspended, and, after circulating around the said cooking-vessels andcommunicating heat to the same, flows through the slots or openings finthe aforenamed horizontal partition-wall, the hot air ascending throughthe slots 0 immediatelybeneath the cooking-vessels a In this manner theair is kept in continuous circulation, as mentioned in reference to thebaking operation. The slots 0 and f are provided with slides q q so thatthe size of the said slots or openings for the circulation of the airinclosed within the walls of the apparatus can be regulated according torequirement.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is 1. The combination of a calorifieror heater 0, inclosedas described, an air-heating chamher around the same, an oven orcooking-compartment above the heater, and a hot-air chamber surroundingsaid compartment and having a passage for hot air from the saidheating-chamber to the hot-air chamber and a separate passage forpartially-cooled air from the hot-air chamber to the heatingehamber, allarranged to maintain a circulation of the same body of airaround thecooking-eompartmeut, substantially as set forth.

The combination of a heater inclosed as described, an air-heatingchamber around the same, a hot-air chamber above said heatingchamber, acooking-compartment inv the heating-chamber, a series of channelsleading, from the upper part of the heating-chamber to the upper part ofthe hot-air chamber, and a separate series of channels leading from thelower part of the hot-air chamber to the lower part of the saidheating-chamber, substantially as set forth.

3. The combination, with a hot-air chamber, of a cooking-compartn'ientwithin the same, an air-heating chambercommunicating with the hot-airchamber, the parts being arranged to produce a continuous circulation ofthe same body of air, and a non-conducting material (I, of varyingthickness, on said cookbig-compartment, substantially as set forth.

i. The combination of a heater inelosed as l a described, an air-heatingchamber around the same, a hot-air chamber above said heatingcha-mber, acooking-compartment in the hotair chamber, a series of channels leadingfrom the upper part of the heating-chamber to the upper part of thehot-airchamber, and a separate series of channels leading from the lowerpartof the hot-air chamber to the lower part of the saidheating-chamber, the latter channels being protected by non-conductingmaterial g, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

DAY] I) GROV E.

Witnesses:

KARL ROSSTENSGI-IER, ANTHONY STEFFEN.

